E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Thread Tools Search this Thread Rate Thread Display Modes
Old 02-21-2013, 08:09 AM   #1
Registered User
Join Date: Aug 2011
Location: Reading, Pennsylvania
Posts: 814
My Ride: 03 325xi, 01 325xi
Send a message via Yahoo to tomoyer
Secondary Air Pump

Service Engine Soon Light has tripped and scanning for codes comes up with the Secondary Air Flow low to cylinders 1-3 and Secondary Air Flow low to cylinders 4-6. Electrical connections to air pump and the hoses are ok. My question is: is there any serviceable parts to the Secondary Air Pump or is it time to replace?
tomoyer is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 02-21-2013, 08:10 AM   #2
Registered User
Join Date: Aug 2011
Location: Reading, Pennsylvania
Posts: 814
My Ride: 03 325xi, 01 325xi
Send a message via Yahoo to tomoyer
Oh, forgot to add that it is a 2003 330xi Sport with slightly over 121,000 miles.
tomoyer is offline   Reply With Quote
Old 02-21-2013, 11:03 AM   #3
Registered User
Join Date: Oct 2010
Location: Minnesnowta
Posts: 3,672
My Ride: 4cyl of fury
Are you sure it's the SAP itself or a leak in the vacuum lines?

To answer your questions, you should be able to replace the valve that diverts air flow to the cats. If you determine the air pump itself is defective, it's time to replace the system (pump and valve) or install an SAP sim to the system.
SamDoe1 is offline   Reply With Quote
Old 02-21-2013, 04:00 PM   #4
Registered User
Join Date: Aug 2011
Location: ma
Posts: 596
My Ride: 330xi MT, mustang gt
If the small vacuum hoses are broken the car will throw a p0491 and p0492 like mine did.
This could be a cloggeg EGR valve or the air pump isn't pushing enough air. Get a mityvac from autozone and test the system.

Last edited by e46alfonso; 02-21-2013 at 04:09 PM.
e46alfonso is offline   Reply With Quote
Old 02-21-2013, 04:42 PM   #5
Registered User
dmax's Avatar
Join Date: Aug 2006
Location: NJ
Posts: 23,709
My Ride: '99 328i 300K miles
Tom...hey, what's up?

First, feel the hose from sap to valve...if it's squishy, remove it from valve and look inside the inlet...mine got clogged from decayed hose material getting blown into that port. Replace hose if you find that.

Also, particularly if you've done anything recently around there, like vcg, the vac hose leaving the valve connects to a hard plastic hose that's very brittle...wraps around behind the manifold. Remove cabin air filter housing and you'll see where it's supposed to connect to.

If you search for me in my thread with 'intake manifold' in it, flashmeow posted some pics of the manifold out of the car...very helpful if you need to get back there. Anyway, that vac line is brittle.

Final thing might be to pop the cover off sap and see if maybe that filter is in dire straights. If so, I 'made' a replacement from a Briggs and Stratton lawnmower filter Better than a $300 pump, huh?

See me in June!
Ha! Ridgehill, Yonkers, June 8, 8 p.m. & Broadway Comedy Club, Sat., June 10, 6 p.m., hosting at the Comedy Cove, Springfield, NJ, June 16 & 17 for Joe DeVito, 9 p.m.
See Facebook for other shows and PM me if you can make one.

Please view this vid so it looks like I'm popular. Please! https://youtu.be/995gLmVEVZk

dmax on Facebook

Mangofy your E46!
dmax is offline   Reply With Quote
Old 02-21-2013, 04:51 PM   #6
Registered User
Join Date: Apr 2009
Location: Fairfax, Va
Posts: 5,805
My Ride: M3
Ill sell you my SAP for $100 shipped!

How to refinish rims

2004 Noble M12 GTO 3R
1998 M3 Coupe
1996 BMW M3
2003 330I ZHP

1998 Honda Civic - Sister Totaled
2002 330CI - SOLD
2006 CBR 600RR - SOLD
1995 M3 Coupe - SOLD
1988 325E - SOLD
1996 Cherokee - SOLD
alwaysbored786 is offline   Reply With Quote
Old 02-21-2013, 06:55 PM   #7
Registered User
Join Date: Mar 2006
Location: Park City, Utah
Posts: 1,016
My Ride: 02 330xi, 88 325iX
Here is a great resource for troubleshooting the secondary air system:

ixtoxi is offline   Reply With Quote
Old 02-21-2013, 07:29 PM   #8
Registered User
Join Date: Sep 2011
Location: TEXAS - Circuit of the Americas doing laps with my M5 and coming in for a pit stop.
Posts: 3,431
My Ride: 03 330iT SportWagon
Probably a clogged secondary valve right there at the exhaust. I would take it off to see if it is clogged and clean it if it is.
Engine swaps, HG, GM & ZF tranny rebuilds.

Over 2 Billion Served !

BMWCaptain is offline   Reply With Quote
Old 02-22-2013, 08:03 AM   #9
Registered User
Join Date: Nov 2012
Location: Woodbury, MN
Posts: 91
My Ride: 02 330xi
Just did mine 2 weekends ago and get this fixed before the pump croaks or it'll get quite a bit more costly than if the pump is still working. I think someone linked the Baverian Autoworks tech article but if not find it and use it.

On my 02 330xi it ended up being a cracked vacuum hose wich caused the valve to stay shut and burn out the air pump and seize the valve. Got all my replacement parts from BMA, by far the cheapest but it was still about $350 for everything including new hoses, valve, pump and rubber pump mounts. The valve comes with a gasket already so no need to order that additionally.

Not a hugely hard DIY, so save the $$$$

Last edited by miweber929; 02-22-2013 at 08:04 AM.
miweber929 is offline   Reply With Quote
Old 12-16-2015, 10:47 PM   #10
Registered User
Join Date: Nov 2015
Posts: 3
325xi p0491
zachg1 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON

All times are GMT -5. The time now is 09:24 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use